Android Wifi 信息保存与忘记

最近在做项目的时候，遇到一个需求，在某一个页面内需要连接指定Wifi，当退出这个页面时需要恢复原来的网络状态。于是就想到了退出页面时忘记此时连接的指定wifi。于是，代码开始了

WifiManager mWifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE); mWifiManager.forget()...

等等，为什么forget是红色的，没提示呢？？？惊叹三秒钟只有赶紧回源码查看，原来是这样的

/**     * Delete the network in the supplicant config.     *     * This function is used instead of a sequence of removeNetwork()     * and saveConfiguration().     *     * @param config the set of variables that describe the configuration,     *            contained in a {@link WifiConfiguration} object.     * @param listener for callbacks on success or failure. Can be null.     * @throws IllegalStateException if the WifiManager instance needs to be     * initialized again     * @hide     */    public void forget(int netId, ActionListener listener) {        if (netId < 0) throw new IllegalArgumentException("Network id cannot be negative");        getChannel().sendMessage(FORGET_NETWORK, netId, putListener(listener));    }

看到这个@hide了没，原来这方法被隐藏掉了，看来要用只能用反射了啊，可是还是不甘心，不想用反射，于是就继续找啊找啊，于是在这个方法的注释里找到了这个：

* This function is used instead of a sequence of removeNetwork()     * and saveConfiguration().

好吧，我们就看看removeNetwork（），

/**     * Remove the specified network from the list of configured networks.     * This may result in the asynchronous delivery of state change     * events.     * @param netId the integer that identifies the network configuration     * to the supplicant     * @return {@code true} if the operation succeeded     */    public boolean removeNetwork(int netId) {        try {            return mService.removeNetwork(netId);        } catch (RemoteException e) {            throw e.rethrowFromSystemServer();        }    }

看了上面的注释，大伙都应该明白了。于是问题完美解决，同样的save也用saveConfiguration()替代

/**     * Tell the supplicant to persist the current list of configured networks.     * <p>     * Note: It is possible for this method to change the network IDs of     * existing networks. You should assume the network IDs can be different     * after calling this method.     *     * @return {@code true} if the operation succeeded     */    public boolean saveConfiguration() {        try {            return mService.saveConfiguration();        } catch (RemoteException e) {            throw e.rethrowFromSystemServer();        }    }

好了，就这样，再查资料的时候找到了有些博客，命名上面方法写的@hide，下面代码还是用forget，不知道最后成功了没。。。

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